Two-part race for roller or ball bearings.



C- A'. HIRTH.

TWO-PART RACE FOR ROLLER OR BALL BEARINGS.

APPLICATION FILED MAR. 19. 19l2- Patented Mar. 27,

ffiffiwsses 25 allowable to make the half races, which are CARL ALBERT HIR'EH, F CANNSTATT-STUTTGART, GERMANY, ASSIGNOR T0 NGRMA COMPAG-NIE'G. M. B, H., 0.? CANNSTATT-STUTTGART, GERMANY, A COBPQRATIOIN OF GERMANY.

TWO-PART neon non ROLLER on. BALL renames.

Specification of Letters Patent. Patented Matt", 2?, 1317.

applieationffled March 19, 1912. Serial No. 684,828.

- To all whom it may concern:

Be it known that I, @ARL ALBERT l-lm'rrr, a citizen of the German Empire, residing at Canhstatt-Stuttgart, in the Kingdom of lVurttemberg, in said Empire, have invented certain new and useful Improvements in Two-Part Races for Roller or Ball Bearings, of which the following is a speeification.

.part, without its being necessary to again adapt the two half rings to one another. In

- other words, it is intended tomake it possible to. remove from a transmission shaft for instance, a roller or ball bearing which has become defective without dismounting the shaft and to reconstruct it on the shaft from other suitable pieces taken from stock, which bearing is then capable of working perfectly without further difficulty.

This diflicult problem could be .solved with known means and methods if it were to be put together, with flat surfaces which fit straight one on another. Unfortunately a ball race must not .be divided in a plane struck through the axis of the bearing, as, when in operation, each roller with the actual supporting surface element would then entirely run simultaneously ofi one half race and encounter the edge of the other half race. It is better to have an oblique dividing plane, but this is insufficient for the rea-' son that it would not prevent or limit a dis- \placement of the half races either in a radial or in a longitudinal direction; A wedge shaped joint would be defective because the vertex of the reentrant angle at which'the wedgeshaped. edge should be laid cannot be machined with suflicient accuracy, so that precisely in the middle of the race ther would be an incomplete contact.

In ball-bearings the circumstances are indeed more favorable but are similar because the contact of the balls is also not at one point. The form of race hereinafter described complies with all requiremen s, as m it the meeting faces of the annular parts are formed as a cylindrical surface accord: ing to a regularly'cu ved and exactly reproducible surface.

This invention is based on the problem of face: which An example of construction is shown in ring of a roller bearing when put together;

Fig. 2 is a side view of the half rings separated, and Fig. 3 represents a rollerbearing applied to a shaft.

Similar letters of reference indicate corresponding parts throughout the several figures of the-drawings.

Both halves of the race are formed identically, each part having a convex and a concave meeting face (a and b respectively), which fits into the corresponding concave and convex meeting face (?2 and a respectively) of the other part. The said faces have the form of cylindrical surfaces. The race surface 0 for the rollers is shown as abylindrical surface but itmight also be slightly spherical and provided. with shoulders at the sides. At both sides the half rings have coned or beveled faces 01'. By means of these faces they may be pressed together by axially acting means, for instance by means of screw-rings f with conical seatsscrewed on the shaft 6 or ona sleeve on the shaft e.

The cylindrical meeting surfaces have particular advantages over others in that they can be ground by the face of a cylindrical grinding disk, that is to say by a, surformly and which can also be axially displaced during the grinding while the grind ing disk may be carried on a pivotal arm of abrades comparatively uni-" the grinding machine which in order to produce 'the desired curvature is adapted to turn on an axis which is fixed during the entire grinding to the clamped thereto, but is otherwise displaceable.

I claim 1. A bearing having a two-part body, consisting of a pair of'duplicate matching' half-rings forminga race, each half-ring having one of its meeting faces formed to a convexo cylindrical surface, and the other meeting face formed to a concave cylindrical surface accurately matching with the convexo cylindrical surface, each of said meeting'faces of each half-ring being curved at all parts thereof to the contour of a semicircle, and said meeting faces being coaxial,

annular piece and alsosubstantially normal to the race when the corresponding abutting convexo and concavo cylindrical meeting faces are pressed tightly against each other, the center of curvature of the semicircular halfring being substantially in the median plane of the bearing.

2. A hearing having a two-part body, consisting of a pair of duplicate matching halfrings forming a race, each half-ring having one of its meeting faces formed to a convexo cylindrical surface and the other meeting'face formed to a concave cylindrical surface accurately matching with the convexo cylindrical surface, each ofsa'd meeting faces of each half-ring being cu'i yed at all parts thereof to the contour of 'tt semicircle, and said meeting faces beingftjagtizial, and alsosubstantially normal to the'mace when the corresponding abutting convexo 20 of the bearing, inclined portions at the ex- 25 terior of the half-rings which are also coaxial when the half-rlngs are pressed tightly against each other, and screw-rings having beveled faces pressing on inclined portions of the matching half-rings for holding thennao firmly together eoaxially both in radial and longitudinal direction.

In testimony whereof I have afiixed my signature in presence of two witnesses.

CARL ALBERT I-IIRTIT.

Vitnesses;

laumxn Knixlnnn, V PAULINE Miinnna 

